feat: initial jump-host — SSH jump host for the theta42 stack

An SSH jump host that authenticates users against the shared LDAP
directory, authorizes them from the SSO Manager's inventory graph, and
bridges them to downstream hosts — auditing everything.

- Username-grammar routing (uid_-_target@jump) + interactive TUI picker
- Inbound LDAP auth (publickey / password with off|local|all policy)
- Directory-driven access (LDAP groups x /api/discovery/resources?group=)
- Per-user key injection into sshPublicKey, connects downstream as the user
- Shell / exec / SFTP-subsystem bridging (WinSCP works)
- Web UI + HTTP API (:3002) for audit + metrics; LDAP-admin gated
- Packaged like proxy: ops/install.sh + systemd, all-in-one Docker, compose
- Tests: 23 unit + 3 integration (node --test), all green

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

nodejs/models/build_info.js

@@ -0,0 +1,24 @@
+'use strict';
+
+// Short git commit, baked into /app/.build_commit at image build time (see
+// Dockerfile gitinfo stage) or resolved from git on bare metal.
+
+const fs = require('fs');
+const path = require('path');
+const { execSync } = require('child_process');
+
+function resolve() {
+	try {
+		const baked = path.join(__dirname, '../../.build_commit');
+		if (fs.existsSync(baked)) return fs.readFileSync(baked, 'utf8').trim();
+	} catch (_) {}
+	try {
+		return execSync('git rev-parse --short HEAD', { stdio: ['ignore', 'pipe', 'ignore'] }).toString().trim();
+	} catch (_) {}
+	return 'unknown';
+}
+
+let version = 'unknown';
+try { version = require('../package.json').version; } catch (_) {}
+
+module.exports = { commit: resolve(), version };